Mickey Crimmons and Bert Mattson opened Mickey's Diner, located at 36 West Seventh Street in downtown St. Paul, in 1939. Such diners had gained popularity early in the twentieth century as inexpensive, often all-night, eateries. Built to resemble a rail car, Mickey's was particularly notable for its unique look. Its unusual architecture made it a local landmark, and earned it a place on the National Register of Historic Places.